uber / h3-go / 39823171393

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Pull #177

github

h3: group the constants and derive the ones that repeat a value

constants.go was one flat block with a few related declarations scattered
through index.go, hierarchy.go and faceijk.go. It is now one block per
concern: exported limits, degree spans, the C library's mathematical
constants, cell geometry counts, index digits, faceNeighbors slots, the
index bit layout and the table sentinels.

Values that restate another are derived from it. The digits are the C
Direction enum, 0 through 7 in order, so they are an iota sequence ending
in numDigits, the one name for 7 as both the digit count and the unset
value of a digit; invalidDigit was the same constant under another name.
dirIJ, dirKI and dirJK are iota + 1, slot 0 of faceNeighbors being the
face itself. twoPiDeg and halfPiDeg come from piDeg, digitMask from
perDigitOffset, h3Init is every digit set to numDigits, and numCellEdges
is one edge per hexagon vertex. maxCellBoundaryVerts duplicated the
exported MaxCellBndryVerts and is gone. numHexChildren and
numPentChildren were also 7 and 6 under other names, one child per valid
digit less the pentagon's deleted one; fullChildCount states them
directly, as its doc comment already did. polyfill set a parent's digit
to digitMask where it meant the unset digit. No value changed.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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